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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c67e7d1e69179d83750e3734fb7e787e26b88dc78efc470a7b9f536cdede8e1' 
  AND token = '/rpjFqZGS4YRZUBfhWom2rRYwUk3DMVGTDd9nIYRlX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}